As one who instructed "intercultural communication" for six years, I've given this considerable thought. Part of the phenomenon undoubtedly derives from the yawning chasm of values that sees many kids just poised to escape home at soon as they turn 18 (or other majority age) as they share absolutely nothing in common with their parents (or often their community). I tried - but not very earnestly - to accommodate the values of my conservative military East Texas parents but never considered making a miserable life just to attempt to adhere to their plans and dreams for me - which would have been the way a young person would have done it in Asia or parts of Europe.
The despair of youth, looking around at the opulence enjoyed by a elder generation while sharply aware that their employment opportunities or private lives will never be as comfortable and secure, is sinking in around the developed world: the Chinese "lay down flat" syndrome, hikikomori in Japan, sullen, resentful Euros, Australians, Canadians and Americans ...
I also point to global birth rates careening downward as another bit of evidence that youth does not care to share the same familial values. Catholic Italy, conservative Japan and Korea, white Americans and Canadians are not making enough babies to maintain the population, which is either a good thing or not, depending on your attitude toward modern civilization.